초록 ▼

A system for use with an inertial reference system and a global position receiver for calculating a position error after a loss of integrity by utilizing the global position system values for position and velocity at a time just before the loss of integrity and by utilizing the inertial reference sy

A system for use with an inertial reference system and a global position receiver for calculating a position error after a loss of integrity by utilizing the global position system values for position and velocity at a time just before the loss of integrity and by utilizing the inertial reference system position modified by the known error in inertial reference system position as it varies with time and the position error as calculated by the global position system velocity extrapolated over the time since integrity loss.

대표청구항 ▼

[ The embodiments of an invention in which an exclusive property or right is claimed are defined as follows:] [15.] A method of determining the position of a vehicle having a velocity and an acceleration, the method comprising the steps of:providing a GPS position signal from a global positioning sy

[ The embodiments of an invention in which an exclusive property or right is claimed are defined as follows:] [15.] A method of determining the position of a vehicle having a velocity and an acceleration, the method comprising the steps of:providing a GPS position signal from a global positioning system;providing an IRS position signal from an inertial navigation system;determining if the GPS position signal is reliable;providing a hybrid position signal to a flight control when the GPS position signal is reliable, the hybrid position signal being based upon the GPS position signal and the IRS position signal; andproviding an estimated IRS position signal to a flight control when the GPS position signal is unreliable, the estimated IRS position signal being based upon the velocity of the vehicle, the acceleration of the vehicle and the IRS position signal.